package com.hmdp.service.impl;

import cn.hutool.Hutool;
import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        //2.生成验证码
        String code = RandomUtil.randomNumbers(6);
        //3.保存验证码到session/redis
//        session.setAttribute("code",code);
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //4.发送验证码
        log.info("发送短信验证码成功，验证码:{}",code);

        return Result.ok(code);
    }

    @Override
    public Result signCount() { //获取截止今日的连续签到天数
        //1.获取当前用户
        Long id = UserHolder.getUser().getId();
        //2.获取当前日期
        LocalDateTime now = LocalDateTime.now();
        String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        //3.拼接key
        String key = USER_SIGN_KEY + id + format;
        //4.获取当天是这个月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取redis对应bitmap   bitfield key get u[dayofMonth] 0 u表示无符号数 i表示返回有符号数  返回的是一个十进制数
        //得到的是一个集合，因为bitfield可以同时进行多个操作，返回多个结果
        List<Long> result = stringRedisTemplate.opsForValue().bitField(key, BitFieldSubCommands.create()
                .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0));
        if (result == null || result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0){
            return Result.ok(0);
        }
        //6.循环遍历返回的十进制数num，和1相与得到最后一个比特位 再进行右移 直到最后一个比特位不为1
        int count = 0;
        while (true){
            if ((num & 1) == 0){
                break;
            }else {
                count++;
            }
            num >>>= 1;
        }
        return Result.ok(count);
    }

    @Override
    public Result sign() {
        //1.获取当前用户
        Long id = UserHolder.getUser().getId();
        //2.获取当前日期
        LocalDateTime now = LocalDateTime.now();
        String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        //3.拼接key
        String key = USER_SIGN_KEY + id + format;
        //4.获取当天是这个月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.存入redis
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        //2.从redis中获取验证码 校验验证码
//        String code =(String) session.getAttribute("code");
        String code = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        if(code == null || !code.equals(loginForm.getCode())){
            return Result.fail("验证码错误");
        }
        //3.查询用户
        User user = query().eq("phone", phone).one();
        //4.判断用户是否存在
        if(user == null){
            //5.不存在则创建用户
            user = createUserWithPhone(phone);
        }
        //6.保存用户到session/redis
//        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));
        //随机生成token作为登陆令牌，以token为key把用户存入redis
        String token = UUID.randomUUID().toString(true);

        Map<String, Object> map = BeanUtil.beanToMap(user,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true)   //忽略空值的逻辑在value.toString();之后，也就是先转换再过滤空值，此时可能出现空指针异常
                        .setFieldValueEditor((fieldName,value)->{
                            if (value!=null){
                                return value.toString();
                            }
                            return null;
                        }));//StringRedisTemplate要求key和value都必须是字符串

        String tokenKey = LOGIN_USER_KEY+token;

        stringRedisTemplate.opsForHash().putAll(tokenKey,map);
        //设置token的过期时间
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //7.返回token给前端
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
